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Polydur Laminating System - Working Procedure

Working Procedure

Mould/Tool preparation

Models should be prepared in the usual way as with any resin system. T2 mould release has been found to be successful with most materials (except styling clay) and applied by soft cloth and polished after solvent evaporation. A minimum of two applications is recommended.

T2 can also be used to take Polydur laminates from Polydur. The Polydur laminate requires no sealing, but three applications of T2 are advised.

Styling clay requires special consideration and varies with different styling clay products; suppliers should be able to make recommendations in respect of this. MK2 has proved suitable for most styling clays but tests should be done with individual styling clay types to determine suitability. Kolb Claypeel has also proved suitable for taking epoxy faced laminates from clay.

Gel Coats - Polydur Surface SGP/L

It is important that the powder (SGP) is added to the liquid (SGL) and is mixed mechanically. This will produce a creamy thixotropic mix, which should be applied with a soft longhaired brush (provided).

A 500gm mix covers approximately 0.4m.

It is only necessary to "paint" a thin layer, as this is subsequently "wet out" with the same material in the Polydur laminate. It is suggested that it be applied more liberally in corners to aid subsequent laminating. The main function of this surface (unlike conventional gel coats) is only to keep the glass layer from the surface of the tool. This thin layer will cure (dependent upon temperature) within 30 minutes and will be observed to turn white uniformly. Laminating can be commenced at any time after this, giving ample time to prepare for the laminating procedure.

Epoxy Surface OH25 / KP25

It is recommended that during the application of OH25 an "off the job" area is gelled in order to determine de-mould time.

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